Cerenkov Radiation That Was Used to Detect Neutrinos from SN

Multiple Choice

Cerenkov radiation that was used to detect neutrinos from SN 1987A was produced by:

A) neutrons ejected from nuclei by the neutrinos.
B) positive electrons (positrons) traveling faster than the speed of light in water.
C) nuclear fusion produced in the detector by neutrinos.
D) electrons and antielectrons (positrons) colliding and annihilating.